Ion mobility spectrometer based on optical fiber SPR sensor

Abstract

An ion mobility spectrometer based on an optical fiber SPR sensor includes a migration pipe and a detector coupled thereto. The detector includes a spectrograph, a bandwidth light source, and an optical fiber SPR sensor. The migration pipe includes, successively in the migration direction of a gas sample, an electrolytic zone, an ion gate, a migration zone, and a focusing zone. An optical fiber probe of the optical fiber SPR sensor is stretched into the migration pipe and is connected to the bandwidth light source and the spectrograph through optical fibers. When ions generated from the to-be-tested gas arrive at the optical fiber probe, intensity of reflecting light in special wavelength is reduced in the optical fibers, and the wavelength corresponding to the weakened reflecting light transmitted in the optical fibers is detected by the spectrograph; then according to the time from the ion gate is opened to the optical fiber probe detects a signal, migration time of the ions in the migration pipe is determined, so that the substances in the gas are detected according to the detected wavelength information and migration time information. The ion mobility spectrometer is high in responding time, detection sensitivity and accuracy, is small in size and has good flexibility.

Description

technical field [0001] The invention relates to an ion mobility spectrometer, in particular to an ion mobility spectrometer based on an optical fiber SPR sensor. Background technique [0002] Ion mobility spectrometry (IMS) detection technology is an effective chemical substance analysis method. It is a method that ionizes gas molecules or particles in the air, and then makes the charged particles migrate in an electric field, and distinguishes them through different migration rates. Substance detection techniques. The detection device of the existing ion mobility spectrometer is a Faraday disk, that is, a conductive metal sheet. The impact of charged particles on the Faraday disk will generate a weak current, and this current signal will become a useful detection signal after being amplified. Although the use of Faraday disks as detectors is relatively mature, there are still some disadvantages that are difficult to solve, such as Johnson noise, gain-bandwidth product lim...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of ion mobility spectrometer based on the optical fiber SPR sensor for the deficiencies of the prior art, to eliminate the presence of Johnson noise in the traditional Faraday disk, limited by the gain-bandwidth product, affected by electromagnetic interference in the air, and induced by the presence of Improve the response speed, detection sensitivity and detection accuracy of the ion mobility spectrometer, and also obtain the advantages of small size, high flexibility and low cost

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